# How Many Bits Does An IPv6 Address Contain?

128 bits

128 bits

## What two 64 bit parts are contained in an IPv6 address?

The first step is to split the address into two parts. The upper 64 bits are used for routing. The lower 64 bits identify the address of the interface or node, and is derived from the actual physical or MAC address using IEEE’s Extended Unique Identifier (EUI-64) format.

32 bits

## How many IP addresses are there in IPv6?

The length of an IPv6 address is 128 bits, compared with 32 bits in IPv4. The address space therefore has 2128 or approximately 3.4×1038 addresses (340,282,366,920,938,463,463,374,607,431,768,211,456, which is approximately 340 undecillion, or 340 billion billion billion billion, addresses).

## What is a valid IPv6 prefix length?

We still have a prefix length of 64 bits. A single hexadecimal character represents 4 binary bits, so the first 16 hexadecimal characters are the prefix: 3211:0000:0000:1234. Now we can add zeros at the end to make it a 128 bit address again and add the prefix length: 3211:0000:0000:1234::/64.

## Which of the following is a valid IPv6 address?

Which of the following are valid IPv6 addresses? An IPv6 IP address is a 128-bit address listed as eight 16-bit hexadecimal sections. Leading zeros can be omitted in each section. Therefore, 6384:1319:7700:7631:446A:5511:8940:2552 and 141:0:0:0:15:0:0:1 are both valid IPv6 addresses.